that's joe biden. >>> standing here outside the walls to jerusalem's old city, we witnessed some intense negotiations between israeli and palestinian leaders who have got down to the core issues, for instance, security and settlements, issues that have eluded their predecessors for more than 60 years. but looming over these talks is a deadline at the end of this month. israel's self-imposed moratorium on building settlements. now, publicly the israeli prime minister benjamin netanyahu says that israel cannot extend the moratorium. president abbas of the palestinians says that if he's forced to make any more concessions, he will simply walk. but will that be their final position? after a meeting between abbas, netanyahu and clinton, i asked whether they had made any progress towards breaking the impasse. prime minister netanyahu told me, "we're working on it. it is a lot of work," he said. and the stakes couldn't be higher for the region, for the obama administration and for secretary clinton, who says she's still optimistic despite a heavy dose of skepticism all around here. i sat with h